public class sampleCon {
  String[] countries = new String[]{};
  public PageReference test() {
    return null;
  }
  public List<SelectOption> getItems() {
    List<SelectOption> options = new List<SelectOption>();
    options.add(new SelectOption('US','US'));
    options.add(new SelectOption('CANADA','Canada'));
    options.add(new SelectOption('MEXICO','Mexico'));
    return options;
  }
  public String[] getCountries() {
    return countries;
  }
  public void setCountries(String[] countries) {
    this.countries = countries;
  }
}